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  1. By: Chuang, T I - Heckard, L R
    Type: Article
    In: Madroño; a West American journal of botany
    Volume: 39
    Date: 1992
    Page Range: 137--149
    Publication Info: Berkeley, California Botanical Society,
  2. By: Chuang, T I - Heckard, L R
    Type: Article
    In: Novon a journal of botanical nomenclature from the Missouri Botanical Garden
    Volume: 2
    Date: 1992
    Page Range: 185--189
    Publication Info: St. Louis, MO, Missouri Botanical Garden,
  3. By: Tanowitz, Barry D - Gordon, Patricia J - Turner, Charles Edward, - Hilu, Khidir W - Cholewa, Anita F - Reveal, James L. - Heckard, L R - Clark, Curtis - Webster, Grady L. (Grady Linder),‏ ‎ - Hartman, Ronald L - Nelson, B E - Dueholm, Keith H. - Dorn, Robert D.
    Type: Article
    In: Madroño; a West American journal of botany
    Volume: 27
    Date: 1980
    Page Range: 176--186
    Publication Info: Berkeley, California Botanical Society,
  4. By: Heckard, L R - Hickman, J C
    Type: Article
    In: Madroño; a West American journal of botany
    Volume: 31
    Date: 1984
    Page Range: 30--47
    Publication Info: Berkeley, California Botanical Society,
  5. By: Chuang, T I - Heckard, L R
    Type: Article
    In: Madroño; a West American journal of botany
    Volume: 23
    Date: 1975
    Page Range: 169--173
    Publication Info: Berkeley, California Botanical Society,
  6. By: Chuang, T I - Heckard, L R
    Type: Article
    In: Madroño; a West American journal of botany
    Volume: 23
    Date: 1975
    Page Range: 88--95
    Publication Info: Berkeley, California Botanical Society,